CN111316727A - User terminal and wireless communication method - Google Patents

Abstract

A user terminal according to an aspect of the present disclosure includes: a receiving unit that receives downlink control information for indicating transmission and/or reception of data; and a control unit that controls activation and/or deactivation of 1 or more Bandwidth parts (BWP) based on a field included in the downlink control information. According to an aspect of the present disclosure, even when PUCCHs of a plurality of UEs share the same resource block, degradation of reception quality can be suppressed.

Description

User terminal and wireless communication method

Technical Field

The present disclosure relates to a user terminal and a wireless communication method in a next generation mobile communication system.

Background

In a UMTS (Universal Mobile Telecommunications System) network, Long Term Evolution (LTE) is standardized for the purpose of higher data rate, lower latency, and the like (non-patent document 1). LTE-a (also referred to as LTE Advanced, LTE rel.10, 11, 12, and 13) is standardized for the purpose of further increasing the capacity and the height of LTE (also referred to as LTE rel.8 and 9).

Subsequent systems of LTE (e.g., also referred to as FRA (Future Radio Access), 5G (5 generation mobile communication system), 5G + (5G plus), NR (New Radio), NX (New Radio Access), FX (Future Radio Access), LTE rel.14 or 15 and beyond) are also under study.

In a conventional LTE system (e.g., LTE rel.8-13), a Downlink (DL: Downlink) and/or an Uplink (UL: Uplink) are communicated using a subframe (also referred to as a Transmission Time Interval (TTI)) of 1 ms. A subframe is a transmission time unit of 1 data packet after channel coding, and is a processing unit of scheduling, link adaptation, retransmission control (HARQ), Hybrid Automatic Repeat request, and the like.

Documents of the prior art

Non-patent document

Non-patent document 1: 3GPP TS 36.300 V8.12.0 "Evolved Universal Radio Access (E-UTRA) and Evolved Universal Radio Access Network (E-UTRAN); (ii) an Overall description; stage 2(Release 8) ", 4 months 2010

Disclosure of Invention

Problems to be solved by the invention

In future wireless communication systems (e.g., NR), setting a Component Carrier (CC) or one or more Bandwidth parts (BWP) included in a system Bandwidth to a user terminal (user equipment (UE)) is being studied. The BWP utilized for DL communication may be referred to as DL BWP and the BWP utilized for UL communication may be referred to as UL BWP.

In NR, BWP-based control is considered to be utilized. However, no study has been made as to how to effect the activation of BWP. If an appropriate activation method of BWP is not introduced, there is a possibility that deterioration in communication throughput, frequency utilization efficiency, and the like may occur due to inability to perform flexible control or failure in decoding of a prescribed signal.

Accordingly, it is an object of the present disclosure to provide a user terminal and a wireless communication method that can suppress a decrease in communication throughput and the like even when BWP-based control is performed.

Means for solving the problems

A user terminal according to an aspect of the present disclosure includes: a receiving unit that receives downlink control information for indicating transmission and/or reception of data; and a control unit that controls activation and/or deactivation of 1 or more Bandwidth parts (BWP) based on a field included in the downlink control information.

Effects of the invention

According to an aspect of the present disclosure, even in the case of performing BWP-based control, it is possible to suppress a decrease in communication throughput and the like.

Drawings

Fig. 1 is a diagram showing an example of the correspondence relationship between CIF values and BWP and/or CC.

Fig. 2 is a diagram showing an example of BWP control by CIF.

Fig. 3 is a diagram showing an example of a schematic configuration of a radio communication system according to an embodiment.

Fig. 4 is a diagram showing an example of the overall configuration of a radio base station according to an embodiment.

Fig. 5 is a diagram showing an example of a functional configuration of a radio base station according to an embodiment.

Fig. 6 is a diagram showing an example of the overall configuration of a user terminal according to an embodiment.

Fig. 7 is a diagram showing an example of a functional configuration of a user terminal according to an embodiment.

Fig. 8 is a diagram showing an example of hardware configurations of a radio base station and a user terminal according to an embodiment.

Detailed Description

In a future wireless communication system (e.g., at least one of NR, 5G, and 5G +, etc., hereinafter abbreviated NR), allocation of ultra-wideband (e.g., 200MHz) Component Carriers (CC) to UEs is being studied. If a UE in which an ultra wideband CC is set always uses the entire system band, power consumption of the UE may become enormous. Therefore, in NR, it is being studied to semi-statically set one or more Bandwidth parts (BWP: Bandwidth part) for a UE per CC.

The BWP utilized for DL communication may be referred to as DL BWP and the BWP utilized for UL communication may be referred to as UL BWP. The UE may assume that at least one DL BWP and one UL BWP, respectively, are active (available) within a specified time in the provisioned BWPs. In addition, the bands of DL BWP and UL BWP may overlap each other.

It is envisaged that BWP is associated with a specific set of parameters (subcarrier spacing, cyclic prefix length, etc.). The UE receives in an active DL BWP using a parameter set associated with the DL BWP and transmits in an active UL BWP using a parameter set associated with the UL BWP.

The UE may receive the setting information of the BWP (which may be referred to as BWP setting) from a base station (e.g., which may be referred to as bs (base station), Transmission/Reception Point (TRP), enb (enode b), gNB, etc.).

The BWP setting may include information indicating at least one of a parameter set, a frequency position (e.g., a center frequency), a bandwidth (e.g., the number of Resource blocks (also referred to as RBs), PRBs (physical RBs), etc.), a time Resource (e.g., a slot (mini-slot) index, a period), and the like of the BWP. The BWP provisioning may be signaled through, for example, higher layer signaling.

The higher layer signaling may be, for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling (e.g., MAC Control element (MAC CE), MAC PDU (Protocol Data Unit)), broadcast Information (Master Information Block, SIB) or the like.

Before setting up BWP from the base station, the UE may assume that a particular BWP is active.

At least one of the set DL BWPs (e.g., the DL BWP included in the primary CC) may include a control resource set (core set) of a common search space (common search space). In addition, the configured DL BWP may also include the core set of the UE-specific search space (UE-specific search space).

The CORESET is an allocation candidate region of a Control channel (e.g., PDCCH (physical Downlink Control channel)), and may be referred to as a Control subband (Control subband), a search space set, a search space resource set, a Control region, a Control subband, an NR-PDCCH region, and the like.

The UE may receive CORESET setting information (which may also be referred to as CORESET settings) from the base station. The CORESET setting may be signaled, for example, by higher layer signaling.

The UE monitors (blind decodes) one or more CORESET for the terminal (or a search space within the CORESET), and detects a DL control channel (DCI) for the UE.

The DCI may be scheduling information including information related to at least one of, for example, a resource (time and/or frequency resource) of scheduled data, a Transport Block (for example, Transport Block Size), a modulation and/or coding scheme, transmission acknowledgement information (also referred to as retransmission control information, HARQ-ACK, ACK/NACK, or the like, for example), a demodulation reference Signal (DMRS) of data, or the like.

The DCI used for scheduling reception of DL data (e.g., a Physical Downlink Shared Channel (PDSCH)) and/or measurement of DL reference signals may also be referred to as DL allocation, DL grant, DL DCI, and the like. The DCI for scheduling transmission of UL data (e.g., a Physical Uplink Shared Channel (PUSCH)) and/or transmission of a UL sounding (measurement) signal may be referred to as a UL grant, a UL DCI, or the like.

Thus, it can be considered that the BWP-based control is utilized in NR. However, no study has been made as to how to effect the activation of BWP. If an appropriate activation method of BWP is not introduced, there is a possibility that deterioration in communication throughput, frequency utilization efficiency, and the like may occur due to inability to perform flexible control or failure in decoding of a prescribed signal.

Accordingly, the present inventors contemplate controlling activation and/or deactivation of BWP through fields contained in DCI.

Embodiments according to the present disclosure will be described in detail below with reference to the accompanying drawings. The radio communication methods according to the respective embodiments may be applied individually or in combination. In the following description, BWP may be replaced with DL BWP, UL BWP, or other BWPs.

Further, the channel may be replaced with a channel of the same use (kind) for an arbitrary length of time. For example, the PDSCH may be replaced by a DL data channel having a time length of 1 or more slots, 1 or more mini-slots, or 1 or more subframes.

(Wireless communication method)

In one embodiment, the UE determines the scheduled BWP through a field contained in a specific DCI. This field may indicate scheduling of the same BWP as the BWP receiving the DCI (may also be referred to as self-BWP scheduling, etc.), or may indicate scheduling of a BWP different from the BWP receiving the DCI (may also be referred to as cross-BWP scheduling, cross (cross) BWP scheduling, BWP activation, BWP adaptation (adaptation), BWP switching (switch), BWP change (changing), etc.).

The cross BWP scheduling may be scheduling in the same CC or cross-CC scheduling (which may also be referred to as cross CC scheduling, cross carrier scheduling, etc.).

Fields included in the DCI may be referred to as a Carrier Indicator Field (CIF), a BWP Indicator Field (BIF), a Carrier/BWP Indicator Field (CBIF), for example. This field is denoted CIF hereinafter.

Regarding one or more BWPs set for the UE, at least one CIF value (CIF value) may be associated with each.

The UE may monitor DCI containing CIF in at least one CORESET associated with a certain BWP. When detecting DCI for scheduling a data channel (e.g., PDSCH, PUSCH, etc.), the UE confirms (check) the CIF value included in the DCI.

In the case where the CIF value indicates the same BWP as the BWP in which the DCI is received, the UE may receive the PDSCH or transmit the PUSCH in the BWP. In case the CIF value indicates another BWP and the other BWP is deactivated, the UE may activate the other BWP and receive a PDSCH or transmit a PUSCH in the other BWP.

In addition, when there is (or a search space is set for) a CORESET (or a search space) associated with the activated BWP, the UE may monitor the PDCCH in the CORESET (or the search space) after the activation of the BWP.

The UE may also determine activation or deactivation of BWP based on CIF. The UE may also determine a BWP (e.g., BWP index) to be the subject of scheduling, activation, and/or deactivation based on the CIF.

The UE may also determine scheduling, activation, deactivation, or a combination thereof, of multiple BWPs based on CIF. For example, a specific CIF may also indicate the scheduling (activation) of a certain BWP and the deactivation of another BWP.

The UE may also determine, based on the CIF, a CC (e.g., CC index, cell index, SCell index, etc.) including a BWP (belonging) that is a target of scheduling, activation, and/or deactivation.

Preferably, the CC containing the CIF-based BWP is activated prior to scheduling, activation or deactivation of the BWP. The UE may receive MAC signaling (e.g., MAC CE) containing information of CCs to be activated and activate the CCs based on the information.

The UE may also receive MAC signaling containing information of the CCs and BWPs to be activated. In this case, the UE may activate a CC according to the information and activate BWP included in the CC.

When a certain CC is activated by the MAC signaling, the MAC signaling may specify which BWP of the CC is activated. In this case, any BWP of the CC to be targeted can be activated using the MAC signaling.

When a certain CC is activated by the MAC signaling, a predetermined specific BWP of the CC may be activated. In this case, when communication is performed in BWP that is not BWP activated by the MAC signaling, the CC and the specific BWP are first activated by the MAC signaling, and then the target BWP is activated again. According to this configuration, since BWP does not need to be specified when the CC is activated, signaling overhead can be reduced.

The UE may receive MAC signaling (e.g., MAC CE) containing information of the CC to be deactivated and deactivate the CC based on the information. The UE may receive MAC signaling containing information of CCs and BWPs to be deactivated. In this case, the UE may deactivate BWP contained in the specific CC based on the information. The UE may deactivate all activated BWPs in a certain CC in case the CC is deactivated by MAC signaling.

In addition, when a BWP included in an inactivated CC is specified by a CIF, the UE may ignore the CIF and may activate the specified BWP. In this case, the UE may also activate a CC containing the designated BWP. The following structure may be adopted: in the case where a BWP included in a CC that is not activated is specified by a CIF and the BWP of the CC is activated, the processing time required for the activation is the same as that in the case of activation through MAC signaling.

In case a certain CC is activated or set, the UE may activate a specific BWP in the CC. The UE may be notified of information related to the specific BWP (e.g., BWP which may also be referred to as default BWP, etc.) from the base station through higher layer signaling (e.g., broadcast information, system information, RRC signaling), physical layer signaling (e.g., DCI), or a combination thereof. Information about this particular BWP may also be derived based on the location of the Synchronization Signal Block (SSB).

As described above, CIFs may be associated with BWPs and/or CCs. The correspondence between the CIF value and the BWP and/or CC indicated by the CIF value may be set for the UE or may be determined by a standard.

The information on the correspondence may be notified from the base station to the UE through higher layer signaling (e.g., RRC signaling), physical layer signaling (e.g., DCI), or a combination thereof.

The information on the correspondence relationship may be included in the CORESET setting or the BWP setting. The correspondence between the CIF value and the BWP and/or CC may be associated with the CORESET that detects the DCI including the CIF, or may be associated with the BWP including the CORESET.

The UE may be provisioned with CIF indicating whether BWP is used in the provisioned CORESET and/or BWP. The information on whether the CIF indicating BWP is used may be notified from the base station to the UE through higher layer signaling (e.g., RRC signaling), physical layer signaling (e.g., DCI), or a combination thereof.

When the UE is set not to use a CIF indicating BWP in a certain CORESET and/or BWP, the CIF of DCI detected in the CORESET and/or BWP may be assumed to be a CIF indicating CC, as in the case of the existing LTE (e.g., LTE rel.13).

In addition, the DCI may include one CIF for determining both CC and BWP, or may include a first CIF for indicating CC and a second CIF for indicating BWP. In the former case, an increase in the amount of information necessary for notification of the control target can be suppressed, and in the latter case, the control target can be specified more finely. In the latter case, the information on the correspondence between the first CIF value and the CC and the information on the correspondence between the second CIF value and the BWP may be notified to the UE by higher layer signaling or the like.

Fig. 1 is a diagram showing an example of the correspondence relationship between CIF values and BWP and/or CC. In this example, CIF is expressed by 2 bits, but the number of bits of CIF is not limited to 2.

In this example, the CIF value 00 corresponds to "BWP #1 of CC # 1", the CIF value 01 corresponds to "BWP #2 of CC # 1", the CIF value 10 corresponds to "BWP #1 of CC # 2", and the CIF value 11 corresponds to "BWP #2 of CC # 2".

In this example, all CIF values correspond to a certain BWP, but are not limited thereto. For example, 1 or more CIF values may be CIF values indicating CCs similar to those of the conventional LTE.

Fig. 2 is a diagram showing an example of BWP control by CIF. In this example, a case where the correspondence relationship shown in fig. 1 is set to the UE will be described. In this example, it is assumed that the bandwidth of BWP #1 in each CC is narrower than BWP # 2. In addition, the setting of BWP is not limited thereto.

In fig. 2, BWP #1 of CC #1 is activated, and the UE performs control to monitor DCI in the CORESET included in BWP #1 of CC # 1.

When detecting DCI #1 indicating CIF 00, the UE transmits or receives using the resource scheduled in BWP #1 of CC # 1. Since BWP #1 of CC #1 has been activated, the scheduled resource may be located at the timing immediately after DCI # 1.

When detecting DCI #2 indicating CIF 01, the UE transmits or receives using the resource scheduled in BWP #2 of CC # 1. Since BWP #2 of CC #1 is not yet activated, the scheduled resource must be located at least a certain period of time (activation delay #1) after DCI #2 in case its activation delay is not negligible. Here, activation delay #1 represents a delay required for activation of BWP #2 in activated CC # 1.

When detecting DCI #3 indicating CIF 00, the UE transmits or receives using the resource scheduled in BWP #1 of CC # 1. In this example, it is assumed that downlink data reception including a MAC CE for activating CC #2 is scheduled for DCI # 3.

Since CC #2 has not been activated, the UE cannot transmit and receive using CC #2 if not after at least a certain period of time (activation delay #2) after receiving the MAC CE. Here, the activation delay #2 indicates a delay required for activation of the inactive (deactivated) CC # 2.

Further, when activating CC #2, the UE may perform control to activate at least one BWP included in CC # 2. In this example, it is envisaged that BWP #1 of CC #2 is also activated for the UE. In this case, the activation delay #2 corresponds to the sum of the delay required for activation of the deactivated CC #2 and the delay required for activation of BWP #1 in CC #2, or the delay required for activation of the deactivated CC # 2. In addition, BWP activated together with activation of CC #2 is not limited to BWP # 1.

After the activation delay #2 has elapsed, the UE transmits or receives using the resource scheduled in BWP #1 of CC #2 when detecting DCI #4 indicating CIF 10. Since BWP #1 of CC #2 has been activated, the scheduled resource may be located at the timing immediately after DCI # 4.

When detecting DCI #5 indicating CIF 11, the UE transmits or receives using the resource scheduled in BWP #2 of CC # 2. Since BWP #2 of CC #2 is not yet activated, the scheduled resource must be located at least a certain period of time (activation delay #3) away from DCI # 5. Here, activation delay #3 represents a delay required for activation of BWP #2 in activated CC # 2.

As described above, to cope with activation delay, DCI including CIF may include information of an offset to a scheduled time resource with reference to a predetermined timing (for example, reception timing of the DCI). For example, DCI #2 may contain information capable of coping with a time offset of activation delay # 1. DCI #3 may include information that can cope with a time offset in either or both of the periods scheduled by activation delay #2 and DCI # 3. The UE may decide the scheduled resources based on the information of the time offset.

Further, the UE may report UE capability information (UE capability) on at least one of an activation delay of the CC and an activation delay of the BWP to the base station. The base station may decide the above time offset based on the UE capability information.

According to the embodiments described above, even when a plurality of BWPs are set for a UE, activation and/or deactivation of the BWPs can be appropriately controlled.

In addition, the activation and/or deactivation in the present invention may be replaced with a statement such as adaptation, adjustment, switching (switch, switching), change (changing), selection (selection), or the like.

(Wireless communication System)

Hereinafter, a configuration of a radio communication system according to an embodiment of the present disclosure will be described. In this wireless communication system, communication is performed by any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination thereof.

Fig. 3 is a diagram showing an example of a schematic configuration of a radio communication system according to an embodiment. In the wireless communication system 1, Carrier Aggregation (CA) and/or Dual Connectivity (DC) that integrates a plurality of basic frequency blocks (component carriers) that are 1 unit in the system bandwidth (e.g., 20MHz) of the LTE system can be applied.

The wireless communication system 1 may be referred to as LTE (Long Term Evolution), LTE-a (LTE-Advanced), LTE-B (LTE-Beyond), SUPER3G, IMT-Advanced, 4G (4th generation mobile communication system ), 5G (5th generation mobile communication system, 5th generation mobile communication system), NR (New Radio), FRA (Future Radio Access), New RAT (Radio Access Technology), or the like, and may also be referred to as a system for implementing them.

The wireless communication system 1 includes a radio base station 11 forming a macrocell C1 having a wide coverage area, and radio base stations 12(12a to 12C) arranged within the macrocell C1 and forming a small cell C2 narrower than the macrocell C1. Further, the user terminal 20 is arranged in the macro cell C1 and each small cell C2. The configuration, number, and the like of each cell and user terminal 20 are not limited to the manner shown in the figure.

User terminal 20 can be connected to both radio base station 11 and radio base station 12. It is assumed that the user terminal 20 simultaneously uses the macro cell C1 and the small cell C2 through CA or DC. Further, the user terminal 20 may apply CA or DC with a plurality of cells (CCs) (e.g., less than 5 CCs, more than 6 CCs).

The user terminal 20 and the radio base station 11 can communicate with each other using a carrier having a narrow bandwidth (referred to as an existing carrier, legacy carrier, or the like) in a relatively low frequency band (e.g., 2 GHz). On the other hand, a carrier having a wide bandwidth may be used between the user terminal 20 and the radio base station 12 in a relatively high frequency band (e.g., 3.5GHz, 5GHz, etc.), or the same carrier as that used between the radio base station 11 may be used. The configuration of the frequency band used by each radio base station is not limited to this.

In addition, the user terminal 20 can perform communication using Time Division Duplex (TDD) and/or Frequency Division Duplex (FDD) in each cell. In addition, a single parameter set may be applied to each cell (carrier), or a plurality of different parameter sets may be applied.

The parameter set may be a communication parameter applied in transmission and/or reception of a certain signal and/or channel, and may also represent at least one of, for example, subcarrier spacing, bandwidth, symbol length, cyclic prefix length, subframe length, TTI length, number of symbols per TTI, radio frame structure, filtering process, windowing process, and the like.

Wireless base station 11 and wireless base station 12 (or 2 wireless base stations 12) may be connected by wire (e.g., optical fiber conforming to Common Public Radio Interface (CPRI), X2 Interface, etc.) or wirelessly.

The radio base station 11 and each radio base station 12 are connected to the upper station apparatus 30, and are connected to the core network 40 via the upper station apparatus 30. The upper station apparatus 30 includes, for example, an access gateway apparatus, a Radio Network Controller (RNC), a Mobility Management Entity (MME), and the like, but is not limited thereto. Each radio base station 12 can be connected to the upper station apparatus 30 via the radio base station 11.

The radio base station 11 is a radio base station having a relatively wide coverage area, and may be referred to as a macro base station, a sink node, an enb (enodeb), a transmission/reception point, or the like. The Radio base station 12 is a Radio base station having a local coverage area, and may be referred to as a small base station, a micro base station, a pico base station, a femto base station, an HeNB (Home eNodeB), an RRH (Remote Radio Head), a transmission/reception point, or the like. Hereinafter, the radio base stations 11 and 12 are collectively referred to as the radio base station 10 without distinguishing them.

Each user terminal 20 is a terminal supporting various communication schemes such as LTE and LTE-a, and may include not only a mobile communication terminal (mobile station) but also a fixed communication terminal (fixed station).

In the wireless communication system 1, as a radio Access scheme, Orthogonal Frequency Division Multiple Access (OFDMA) is applied to the downlink, and Single Carrier Frequency Division Multiple Access (SC-FDMA) and/or OFDMA is applied to the uplink.

OFDMA is a multicarrier transmission scheme in which a frequency band is divided into a plurality of narrow frequency bands (subcarriers) and data is mapped to each subcarrier to perform communication. SC-FDMA is a single carrier transmission scheme in which a system bandwidth is divided into 1 or consecutive resource blocks for each terminal, and different bands are used by a plurality of terminals, thereby reducing interference between terminals. The uplink and downlink radio access schemes are not limited to these combinations, and other radio access schemes may be used.

In the radio communication system 1, downlink channels such as a Physical Downlink Shared Channel (PDSCH), a broadcast Channel (PBCH), and a downlink L1/L2 control Channel, which are Shared by the user terminals 20, are used as downlink channels. User data, higher layer control Information, SIB (System Information Block), and the like are transmitted through the PDSCH. Also, MIB (Master Information Block) is transmitted through PBCH.

The Downlink L1/L2 Control Channel includes a PDCCH (Physical Downlink Control Channel), an EPDCCH (Enhanced Physical Downlink Control Channel), a PCFICH (Physical Control Format Indicator Channel), a PHICH (Physical Hybrid-ARQ Indicator Channel), and the like. Downlink Control Information (DCI) including scheduling Information of the PDSCH and/or the PUSCH is transmitted through the PDCCH.

In addition, the scheduling information may also be notified through DCI. For example, DCI scheduling DL data reception may also be referred to as DL allocation, and DCI scheduling UL data transmission may also be referred to as UL grant.

The number of OFDM symbols for PDCCH is transmitted through PCFICH. Delivery confirmation information (for example, also referred to as retransmission control information, HARQ-ACK, ACK/NACK, and the like) of HARQ (Hybrid Automatic Repeat reQuest) for PUSCH is transmitted through PHICH. EPDCCH and PDSCH (downlink shared data channel) are frequency division multiplexed, and are used for transmitting DCI and the like in the same manner as PDCCH.

In the radio communication system 1, as Uplink channels, an Uplink Shared Channel (PUSCH), an Uplink Control Channel (PUCCH), a Random Access Channel (PRACH), and the like, which are Shared by the user terminals 20, are used. User data, higher layer control information, etc. are transmitted through the PUSCH. Also, downlink radio Quality information (Channel Quality Indicator (CQI)), acknowledgement information, Scheduling Request (SR), and the like are transmitted through the PUCCH. A random access preamble for establishing a connection with a cell is transmitted through the PRACH.

In the wireless communication system 1, as downlink Reference signals, Cell-specific Reference signals (CRS), Channel state information Reference signals (CSI-RS), DeModulation Reference signals (DMRS), Positioning Reference Signals (PRS), and the like are transmitted. In addition, in the wireless communication system 1, as the uplink reference signal, a measurement reference signal (SRS: Sounding reference signal), a demodulation reference signal (DMRS), and the like are transmitted. In addition, the DMRS may also be referred to as a user terminal specific Reference Signal (UE-specific Reference Signal). The reference signal to be transmitted is not limited to this.

(radio base station)

Fig. 4 is a diagram showing an example of the overall configuration of a radio base station according to an embodiment. The radio base station 10 includes: a plurality of transmission/reception antennas 101, an amplifier unit 102, a transmission/reception unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission path interface 106. The configuration may include 1 or more transmission/reception antennas 101, amplifier units 102, and transmission/reception units 103.

User data transmitted from the radio base station 10 to the user terminal 20 in the downlink is input from the upper station apparatus 30 to the baseband signal processing unit 104 via the transmission line interface 106.

In baseband signal processing section 104, with respect to user Data, transmission processes such as a process of a PDCP (Packet Data convergence protocol) layer, a process of dividing/combining user Data, a transmission process of an RLC (Radio link Control) layer such as RLC retransmission Control, MAC (Medium Access Control) retransmission Control (for example, HARQ transmission process), scheduling, transport format selection, channel coding, Inverse Fast Fourier Transform (IFFT) process, and precoding process are performed, and the user Data is forwarded to transmitting/receiving section 103. Further, the downlink control signal is also subjected to transmission processing such as channel coding and inverse fast fourier transform, and is forwarded to transmission/reception section 103.

Transmission/reception section 103 converts the baseband signal, which is output by precoding for each antenna from baseband signal processing section 104, into a radio frequency band and transmits the radio frequency band. The radio frequency signal subjected to frequency conversion in transmission/reception section 103 is amplified by amplifier section 102 and transmitted from transmission/reception antenna 101. The transmitting/receiving section 103 can be configured by a transmitter/receiver, a transmitting/receiving circuit, or a transmitting/receiving device described based on common knowledge in the technical field related to the present disclosure. The transmission/reception unit 103 may be an integrated transmission/reception unit, or may be composed of a transmission unit and a reception unit.

On the other hand, as for the uplink signal, the radio frequency signal received by the transmission/reception antenna 101 is amplified by the amplifier unit 102. Transmission/reception section 103 receives the uplink signal amplified by amplifier section 102. Transmission/reception section 103 frequency-converts the received signal into a baseband signal, and outputs the baseband signal to baseband signal processing section 104.

The baseband signal processing section 104 performs Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing, error correction decoding, reception processing for MAC retransmission control, and reception processing for the RLC layer and the PDCP layer on the user data included in the input uplink signal, and transfers the user data to the upper station apparatus 30 via the transmission path interface 106. The call processing unit 105 performs call processing (setting, release, and the like) of a communication channel, state management of the radio base station 10, management of radio resources, and the like.

The transmission line interface 106 transmits and receives signals to and from the upper station apparatus 30 via a predetermined interface. Further, the transmission path Interface 106 may transmit and receive (backhaul signaling) signals with other Radio base stations 10 via an inter-base station Interface (e.g., an optical fiber compliant with Common Public Radio Interface (CPRI), X2 Interface).

The transmission/reception unit 103 may transmit Downlink Control Information (DCI) for instructing transmission and/or reception of data to the user terminal 20. The transmitting and receiving unit 103 may transmit information indicating a correspondence relationship of a CIF value and BWP and/or CC indicated by the CIF value to the user terminal 20.

Fig. 5 is a diagram illustrating an example of a functional configuration of a radio base station according to an embodiment of the present disclosure. In this example, the functional blocks of the characteristic parts in the present embodiment are mainly shown, and the radio base station 10 can be conceived to further include other functional blocks necessary for radio communication.

The baseband signal processing section 104 includes at least a control section (scheduler) 301, a transmission signal generation section 302, a mapping section 303, a reception signal processing section 304, and a measurement section 305. These configurations may be included in the radio base station 10, and some or all of the configurations may not be included in the baseband signal processing section 104.

The control unit (scheduler) 301 performs overall control of the radio base station 10. The control unit 301 can be configured by a controller, a control circuit, or a control device described based on common knowledge in the technical field related to the present disclosure.

The control unit 301 controls, for example, generation of a signal by the transmission signal generation unit 302, allocation of a signal by the mapping unit 303, and the like. Further, the control unit 301 controls reception processing of the signal by the reception signal processing unit 304, measurement of the signal by the measurement unit 305, and the like.

Control section 301 controls scheduling (e.g., resource allocation) of system information, downlink data signals (e.g., signals transmitted in PDSCH), downlink control signals (e.g., signals transmitted in PDCCH and/or EPDCCH. Control section 301 also controls generation of a downlink control signal, a downlink data signal, and the like based on the determination result of whether retransmission control for the uplink data signal is necessary or not, and the like.

Control section 301 controls scheduling of Synchronization signals (e.g., PSS (Primary Synchronization Signal)/SSS (Secondary Synchronization Signal)), downlink reference signals (e.g., CRS, CSI-RS, DMRS), and the like.

Control section 301 controls scheduling of an uplink data signal (e.g., a signal transmitted on a PUSCH), an uplink control signal (e.g., a signal transmitted on a PUCCH and/or a PUSCH, acknowledgement information, etc.), a random access preamble (e.g., a signal transmitted on a PRACH), an uplink reference signal, and the like.

The control unit 301 may perform control of transmitting Downlink Control Information (DCI) including a field for controlling activation and/or deactivation of 1 or more bandwidth parts (BWPs) to the user terminal 20.

The control unit 301 may perform control of transmitting prescribed MAC signaling containing information for controlling activation and/or deactivation of 1 or more bandwidth parts (BWPs) to the user terminal 20.

Transmission signal generating section 302 generates a downlink signal (downlink control signal, downlink data signal, downlink reference signal, and the like) based on an instruction from control section 301, and outputs the downlink signal to mapping section 303. The transmission signal generation unit 302 can be configured by a signal generator, a signal generation circuit, or a signal generation device described based on common knowledge in the technical field related to the present disclosure.

Transmission signal generating section 302 generates, for example, a DL assignment for notifying assignment information of downlink data and/or an UL grant for notifying assignment information of uplink data, based on an instruction from control section 301. Both DL allocation and UL grant are DCI and comply with DCI format. The downlink data signal is subjected to coding processing and modulation processing according to a coding rate, a modulation scheme, and the like determined based on Channel State Information (CSI) and the like from each user terminal 20.

Mapping section 303 maps the downlink signal generated in transmission signal generating section 302 to a predetermined radio resource based on an instruction from control section 301, and outputs the result to transmitting/receiving section 103. The mapping unit 303 can be constituted by a mapper, a mapping circuit, or a mapping device explained based on common knowledge in the technical field to which the present disclosure relates.

Received signal processing section 304 performs reception processing (for example, demapping, demodulation, decoding, and the like) on the received signal input from transmission/reception section 103. Here, the reception signal is, for example, an uplink signal (an uplink control signal, an uplink data signal, an uplink reference signal, or the like) transmitted from the user terminal 20. The received signal processing unit 304 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common knowledge in the technical field related to the present disclosure.

Received signal processing section 304 outputs information decoded by the reception processing to control section 301. For example, when a PUCCH including HARQ-ACK is received, HARQ-ACK is output to control section 301. Further, the received signal processing unit 304 outputs the received signal and/or the reception-processed signal to the measurement unit 305.

The measurement unit 305 performs measurements related to the received signal. The measurement unit 305 can be configured by a measurement instrument, a measurement circuit, or a measurement device described based on common knowledge in the technical field related to the present disclosure.

For example, the measurement unit 305 may perform RRM (radio resource Management) measurement, csi (channel State information) measurement, and the like based on the received signal. Measurement section 305 may also measure Received power (e.g., RSRP (Reference Signal Received power)), Received quality (e.g., RSRQ (Reference Signal Received quality)), SINR (Signal to Interference plus Noise Ratio)), SNR (Signal to Noise Ratio)), Signal Strength (e.g., RSSI (Received Signal Strength Indicator)), propagation path information (e.g., CSI), and the like. The measurement result may be output to the control unit 301.

(user terminal)

Fig. 6 is a diagram showing an example of the overall configuration of a user terminal according to an embodiment. The user terminal 20 includes a plurality of transmission/reception antennas 201, an amplifier unit 202, a transmission/reception unit 203, a baseband signal processing unit 204, and an application unit 205. The number of the transmission/reception antenna 201, the amplifier unit 202, and the transmission/reception unit 203 may be 1 or more.

The radio frequency signal received through the transmission and reception antenna 201 is amplified in the amplifier unit 202. Transmission/reception section 203 receives the downlink signal amplified by amplifier section 202. Transmission/reception section 203 frequency-converts the received signal into a baseband signal, and outputs the baseband signal to baseband signal processing section 204. The transmitting/receiving unit 203 can be configured by a transmitter/receiver, a transmitting/receiving circuit, or a transmitting/receiving device described based on common knowledge in the technical field of the present disclosure. The transmission/reception section 203 may be configured as an integrated transmission/reception section, or may be configured by a transmission section and a reception section.

The baseband signal processing section 204 performs FFT processing, error correction decoding, reception processing of retransmission control, and the like on the input baseband signal. The downlink user data is forwarded to the application unit 205. The application section 205 performs processing and the like relating to layers higher than the physical layer and the MAC layer. In addition, in the downlink data, the broadcast information may also be forwarded to the application unit 205.

On the other hand, uplink user data is input from the application unit 205 to the baseband signal processing unit 204. Baseband signal processing section 204 performs transmission processing for retransmission control (for example, transmission processing for HARQ), channel coding, precoding, Discrete Fourier Transform (DFT) processing, IFFT processing, and the like, and forwards the result to transmitting/receiving section 203.

Transmission/reception section 203 converts the baseband signal output from baseband signal processing section 204 into a radio frequency band and transmits the radio frequency band. The radio frequency signal frequency-converted by the transmission/reception section 203 is amplified by the amplifier section 202 and transmitted from the transmission/reception antenna 201.

Transmission/reception section 203 receives Downlink Control Information (DCI) for instructing transmission and/or reception of data, and transmits and/or receives data according to the DCI. The transmission/reception unit 203 may also receive, from the radio base station 10, information indicating the correspondence relationship between the CIF value and the BWP and/or CC indicated by the CIF value.

Fig. 7 is a diagram showing an example of a functional configuration of a user terminal according to an embodiment. In this example, the functional blocks of the characteristic parts in the present embodiment are mainly shown, and the user terminal 20 can be conceived to have other functional blocks necessary for wireless communication.

The baseband signal processing section 204 included in the user terminal 20 includes at least a control section 401, a transmission signal generation section 402, a mapping section 403, a received signal processing section 404, and a measurement section 405. These components may be included in the user terminal 20, or some or all of the components may not be included in the baseband signal processing section 204.

The control unit 401 performs overall control of the user terminal 20. The control unit 401 can be configured by a controller, a control circuit, or a control device described in common knowledge in the technical field related to the present disclosure.

The control unit 401 controls, for example, generation of a signal by the transmission signal generation unit 402, allocation of a signal by the mapping unit 403, and the like. Further, the control unit 401 controls reception processing of the signal of the reception signal processing unit 404, measurement of the signal of the measurement unit 405, and the like.

Control section 401 acquires the downlink control signal and the downlink data signal transmitted from radio base station 10 from received signal processing section 404. Control section 401 controls generation of an uplink control signal and/or an uplink data signal based on a downlink control signal and/or a result of determination as to whether retransmission control for a downlink data signal is necessary.

The control unit 401 may control activation and/or deactivation of 1 or more bandwidth parts (BWPs) based on a field included in Downlink Control Information (DCI) acquired from the received signal processing unit 404.

For example, in the case where the above-described field indicates a BWP different from the BWP at which the DCI is received, the control unit 401 may control activation and/or deactivation of the different BWP.

The control unit 401 may determine a carrier containing more than 1 BWP based on the above-mentioned fields, and control activation and/or deactivation of more than 1 BWP in the carrier.

The control unit 401 may control activation and/or deactivation of 1 or more BWPs based on prescribed MAC signaling acquired from the received signal processing unit 404.

Further, when various information notified from radio base station 10 is acquired from received signal processing section 404, control section 401 may update parameters for control based on the information.

Transmission signal generating section 402 generates an uplink signal (an uplink control signal, an uplink data signal, an uplink reference signal, and the like) based on an instruction from control section 401, and outputs the uplink signal to mapping section 403. The transmission signal generation unit 402 can be configured by a signal generator, a signal generation circuit, or a signal generation device, which are described based on common knowledge in the technical field of the present disclosure.

Transmission signal generating section 402 generates an uplink control signal related to transmission acknowledgement information, Channel State Information (CSI), and the like, based on a command from control section 401, for example. Further, transmission signal generation section 402 generates an uplink data signal based on an instruction from control section 401. For example, when the UL grant is included in the downlink control signal notified from radio base station 10, transmission signal generating section 402 is instructed from control section 401 to generate the uplink data signal.

Mapping section 403 maps the uplink signal generated in transmission signal generating section 402 to a radio resource based on an instruction from control section 401, and outputs the result to transmitting/receiving section 203. The mapping unit 403 can be constituted by a mapper, a mapping circuit, or a mapping device explained based on common knowledge in the technical field to which the present disclosure relates.

Received signal processing section 404 performs reception processing (for example, demapping, demodulation, decoding, and the like) on the received signal input from transmission/reception section 203. Here, the reception signal is, for example, a downlink signal (downlink control signal, downlink data signal, downlink reference signal, or the like) transmitted from the radio base station 10. The received signal processing unit 404 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common knowledge in the technical field related to the present disclosure. Further, the received signal processing unit 404 can constitute a receiving unit according to the present disclosure.

The received signal processing unit 404 outputs information decoded by the reception processing to the control unit 401. Received signal processing section 404 outputs, for example, broadcast information, system information, RRC signaling, DCI, and the like to control section 401. Further, the received signal processing unit 404 outputs the received signal and/or the signal after the reception processing to the measurement unit 405.

The measurement unit 405 performs measurements related to the received signal. The measurement unit 405 can be configured by a measurement instrument, a measurement circuit, or a measurement device described based on common knowledge in the technical field related to the present disclosure.

For example, the measurement unit 405 may perform RRM measurement, CSI measurement, or the like based on the received signal. Measurement unit 405 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), and the like. The measurement result may be output to the control unit 401.

(hardware construction)

The block diagrams used in the description of the above embodiments represent blocks in functional units. These functional blocks (structural units) are implemented by any combination of hardware and/or software. The method of implementing each functional block is not particularly limited. That is, each functional block may be implemented by 1 apparatus which is physically and/or logically combined, or by a plurality of apparatuses which are directly and/or indirectly (for example, by wired and/or wireless) connected to two or more apparatuses which are physically and/or logically separated.

For example, a radio base station, a user terminal, and the like in one embodiment of the present disclosure may function as a computer that performs processing of the radio communication method of the present disclosure. Fig. 8 is a diagram showing an example of hardware configurations of a radio base station and a user terminal according to an embodiment. The radio base station 10 and the user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

In the following description, the term "device" may be replaced with a circuit, an apparatus, a unit, or the like. The hardware configuration of the radio base station 10 and the user terminal 20 may include 1 or a plurality of each illustrated device, or may be configured without including some devices.

For example, only 1 processor 1001 is shown, but there may be multiple processors. The processing may be executed by 1 processor, or the processing may be executed by 1 or more processors simultaneously, sequentially, or by using another method. The processor 1001 may be implemented by 1 or more chips.

Each function of the radio base station 10 and the user terminal 20 is realized by, for example, reading predetermined software (program) into hardware such as the processor 1001 and the memory 1002, performing an operation by the processor 1001, and controlling communication via the communication device 1004 or controlling reading and/or writing of data in the memory 1002 and the storage 1003.

The processor 1001 controls the entire computer by operating an operating system, for example. The processor 1001 may be constituted by a Central Processing Unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like. For example, the baseband signal processing unit 104(204), the call processing unit 105, and the like may be implemented by the processor 1001.

Further, the processor 1001 reads a program (program code), a software module, data, and the like from the storage 1003 and/or the communication device 1004 to the memory 1002, and executes various processes based on them. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiments is used. For example, the control unit 401 of the user terminal 20 may be realized by a control program stored in the memory 1002 and operated in the processor 1001, and other functional blocks may be similarly realized.

The Memory 1002 is a computer-readable recording medium, and may be constituted by at least 1 of ROM (Read only Memory), EPROM (erasable Programmable ROM), EEPROM (electrically EPROM), RAM (Random Access Memory), and other suitable storage media. The memory 1002 may also be referred to as a register, cache, main memory (primary storage), or the like. The memory 1002 can store executable programs (program codes), software modules, and the like for implementing the wireless communication method of an embodiment.

The storage 1003 is a computer-readable recording medium, and may be configured of at least 1 of a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (e.g., a compact Disc (CD-rom), etc.), a digital versatile disk, a Blu-ray (registered trademark) disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, or another suitable storage medium, for example. The storage 1003 may also be referred to as a secondary storage device.

The communication device 1004 is hardware (transmission/reception device) for performing communication between computers via a wired and/or wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like, for example. The communication device 1004 may be configured to include a high-Frequency switch, a duplexer, a filter, a Frequency synthesizer, and the like, for example, in order to realize Frequency Division Duplex (FDD) and/or Time Division Duplex (TDD). For example, the transmission/ reception antennas 101 and 201, the amplifier units 102 and 202, the transmission/ reception units 103 and 203, the transmission line interface 106, and the like described above may be implemented by the communication device 1004.

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a key, a sensor, and the like) that receives an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED (Light Emitting Diode) lamp, or the like) that performs output to the outside. The input device 1005 and the output device 1006 may be integrated (for example, a touch panel).

Further, the processor 1001, the memory 1002, and the like are connected by a bus 1007 for communicating information. The bus 1007 may be constituted by 1 bus or by buses different among devices.

The radio base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a Digital Signal Processor (DSP), an ASIC (Application specific integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array), and a part or all of the functional blocks may be implemented by the hardware. For example, the processor 1001 may be implemented with at least 1 of these hardware.

(modification example)

In addition, terms described in the specification and/or terms necessary for understanding the specification may be replaced with terms having the same or similar meanings. For example, the channels and/or symbols may also be signals (signaling). Further, the signal may also be a message. The Reference Signal can also be referred to simply as RS (Reference Signal) and, depending on the standard applied, may also be referred to as Pilot (Pilot), Pilot Signal, etc. In addition, a Component Carrier (CC) may also be referred to as a cell, a frequency carrier, a carrier frequency, and the like.

The radio frame may be configured of 1 or more periods (frames) in the time domain. The 1 or more periods (frames) constituting the radio frame may also be referred to as subframes. Further, the subframe may be formed of 1 or more slots in the time domain. The subframe may be a fixed duration (e.g., 1ms) independent of a parameter set (Numerology).

Further, the slot may be formed of 1 or more symbols in the time domain (OFDM (Orthogonal Frequency Division Multiplexing) symbol, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbol, or the like). Also, the slot may be a time unit based on a parameter set (Numerology). Also, a slot may contain multiple mini-slots (mini-slots). Each mini-slot may be composed of 1 or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot.

The radio frame, subframe, slot, mini-slot, and symbol all represent a unit of time when a signal is transmitted. The radio frame, subframe, slot, mini-slot, and symbol may also use other designations corresponding to each. For example, 1 subframe may be referred to as a Transmission Time Interval (TTI), a plurality of consecutive subframes may be referred to as a TTI, and 1 slot or 1 mini-slot may be referred to as a TTI. That is, the subframe and/or TTI may be a subframe (1ms) in the conventional LTE, may be a period shorter than 1ms (for example, 1 to 13 symbols), or may be a period longer than 1 ms. Note that the unit indicating TTI may be referred to as a slot (slot), a mini-slot (mini-slot), or the like instead of a subframe.

Here, the TTI refers to, for example, the minimum time unit of scheduling in wireless communication. For example, in the LTE system, the radio base station performs scheduling for allocating radio resources (such as a frequency bandwidth and transmission power usable by each user terminal) to each user terminal in units of TTIs. In addition, the definition of TTI is not limited thereto.

The TTI may be a transmission time unit of a channel-coded data packet (transport block), code block, and/or code word, or may be a processing unit such as scheduling or link adaptation. In addition, when a TTI is given, the time region (e.g., number of symbols) to which a transport block, code block, and/or codeword is actually mapped may be shorter than the TTI.

In addition, in a case where 1 slot or 1 mini-slot is referred to as a TTI, 1 or more TTIs (i.e., 1 or more slots or 1 or more mini-slots) may be the minimum time unit for scheduling. Further, the number of slots (mini-slot number) constituting the minimum time unit of the schedule may be controlled.

The TTI having the duration of 1ms may also be referred to as a normal TTI (TTI in LTE rel.8-12), a normal (normal) TTI, a long (long) TTI, a normal subframe, a normal (normal) subframe, or a long (long) subframe, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI, a shortened subframe, a short subframe, a mini-slot, a sub-slot, or the like.

In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be replaced with a TTI having a time length exceeding 1ms, and a short TTI (e.g., a shortened TTI, etc.) may be replaced with a TTI having a TTI length smaller than that of the long TTI and equal to or longer than 1 ms.

A Resource Block (RB) is a Resource allocation unit in the time domain and the frequency domain, and may include 1 or a plurality of consecutive subcarriers (subcarriers) in the frequency domain. In addition, an RB may include 1 or more symbols in the time domain, and may have a length of 1 slot, 1 mini-slot, 1 subframe, or 1 TTI. Each of the 1 TTI and 1 subframe may be formed of 1 or more resource blocks. In addition, 1 or more RBs may also be referred to as Physical Resource Blocks (PRBs), Sub-Carrier groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB peers, and so on.

In addition, a Resource block may be composed of 1 or more Resource Elements (REs). For example, 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.

The structure of the radio frame, the subframe, the slot, the mini slot, the symbol, and the like is merely an example. For example, the structure of the number of subframes included in the radio frame, the number of slots per subframe or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the Cyclic Prefix (CP) length, and the like can be variously modified.

The information, parameters, and the like described in the present specification may be expressed by absolute values, relative values to predetermined values, or other corresponding information. For example, the radio resource may be indicated by a predetermined index.

The names used for the parameters and the like in the present specification are not limitative names in any point. For example, various channels (PUCCH (Physical Uplink Control Channel), PDCCH (Physical Downlink Control Channel), and the like) and information elements can be identified by all appropriate names, and thus various names assigned to these various channels and information elements are not limitative names in any point.

Information, signals, and the like described in this specification can be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any combination thereof.

Further, information, signals, etc. may be output from a higher layer to a lower layer and/or from a lower layer to a higher layer. Information, signals, and the like may be input and output via a plurality of network nodes.

The information, signals, and the like to be input and output may be stored in a specific area (for example, a memory) or may be managed by a management table. Information, signals, etc. that are input and output may also be overwritten, updated, or added. The information, signals, etc. that are output may also be deleted. The input information, signal, and the like may be transmitted to other devices.

The information notification is not limited to the embodiments and modes described in the present specification, and may be performed by other methods. For example, the notification of the Information may be implemented by physical layer signaling (e.g., Downlink Control Information (DCI)), Uplink Control Information (UCI), uplink Control Information (RRC), higher layer signaling (e.g., RRC (Radio resource Control) signaling), broadcast Information (Master Information Block, System Information Block (SIB), etc.), MAC (Medium Access Control) signaling), other signals, or a combination thereof.

In addition, physical Layer signaling may also be referred to as L1/L2 (Layer 1/Layer 2)) control information (L1/L2 control signals), L1 control information (L1 control signals), and the like. The RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration) message, or the like. Further, the MAC signaling may be notified using, for example, a MAC control element (MAC ce (control element)).

Note that the notification of the predetermined information (for example, the notification of "X") is not limited to the explicit notification, and may be performed implicitly (for example, by not notifying the predetermined information or by notifying other information).

The determination may be performed by a value (0 or 1) represented by 1 bit, by a true-false value (Boolean) represented by true (true) or false (false)), or by a comparison of values (for example, a comparison with a predetermined value).

Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names, is intended to be broadly interpreted as representing instructions, instruction sets, code segments, program code, programs, subroutines, software modules, applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like.

Further, software, instructions, information, etc. may be transmitted or received via a transmission medium. For example, where the software is transmitted from a website, server, or other remote source using wired and/or wireless techniques (e.g., coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and/or wireless techniques (e.g., infrared, microwave, etc.), such wired and/or wireless techniques are included in the definition of transmission medium.

The terms "system" and "network" used in this specification may be used interchangeably.

In the present specification, terms such as "Base Station (BS)", "radio Base Station", "eNB", "gNB", "cell", "sector", "cell group", "carrier", and "component carrier" are used interchangeably. A base station may also be referred to by terms such as a fixed station (fixed station), NodeB, eNodeB (eNB), access point (access point), transmission point, reception point, femto cell, and small cell.

A base station can accommodate 1 or more (e.g., three) cells (also referred to as sectors). In the case where a base station accommodates multiple cells, the coverage area of the base station as a whole can be divided into multiple smaller areas, and each smaller area can also be provided with communication services through a base station subsystem (e.g., an indoor small base station (RRH) Radio Head) — terms such as "cell" or "sector," which refer to a part or all of the coverage area of the base station and/or base station subsystem that is performing communication services in the coverage area.

In this specification, terms such as "Mobile Station (MS)", "User terminal (User terminal)", "User Equipment (UE)", and "terminal" are used interchangeably.

A mobile station is also sometimes referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless communications device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, or some other suitable terminology.

In addition, the radio base station in this specification may be replaced with a user terminal. For example, the aspects and embodiments of the present disclosure may be applied to a configuration in which communication between a radio base station and a user terminal is replaced with communication between a plurality of user terminals (Device-to-Device (D2D)). In this case, the user terminal 20 may be configured to have the functions of the radio base station 10. The terms "upstream" and "downstream" may be changed to "side". For example, the uplink channel may be replaced with a side channel (side channel).

Similarly, the user terminal in this specification may be replaced with a radio base station. In this case, the radio base station 10 may be configured to have the functions of the user terminal 20.

In this specification, an operation performed by a base station is sometimes performed by its upper node (uplink) according to circumstances. In a network including 1 or more network nodes (network nodes) having a base station, it is apparent that various operations performed for communication with a terminal may be performed by the base station, 1 or more network nodes other than the base station (for example, an MME (Mobility Management Entity), an S-GW (Serving-Gateway), and the like are considered, but not limited thereto), or a combination thereof.

The embodiments and modes described in this specification may be used alone, may be used in combination, or may be switched depending on execution. Note that, the order of the processing procedures, sequences, flowcharts, and the like of the respective modes and embodiments described in the present specification may be changed as long as they are not contradictory. For example, elements of the method described in the present specification are presented in the order of illustration, and are not limited to the specific order presented.

The aspects/embodiments described in this specification may be applied to LTE (Long term evolution), LTE-a (LTE-Advanced), LTE-B (LTE-Beyond), SUPER3G, IMT-Advanced, 4G (4th generation Mobile communication System), 5G (5th generation Mobile communication System), FRA (Future Radio Access), New-RAT (Radio Access Technology), NR (New Radio trademark), NX (New Radio Access), FX (next generation Radio Access), GSM (Broadband Mobile communication System (Global for Mobile communication), Radio Access System (IEEE) 802, 11, Mobile Radio Access (Radio Access), Radio Access System (Radio Access) 802, Radio Access System (Radio Access), Radio Access System (Radio Access System, Radio, IEEE 802.16(WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), and systems using other appropriate wireless communication methods and/or next-generation systems expanded based thereon.

As used in this specification, a statement that "is based on" does not mean "is based only on" unless explicitly stated otherwise. In other words, the expression "based on" means both "based only on" and "based at least on".

Any reference to the use of the terms "first," "second," etc. in this specification is not intended to limit the number or order of such elements in a comprehensive manner. These designations may be used herein as a convenient means of distinguishing between two or more elements. Thus, reference to first and second elements does not mean that only two elements may be employed or that the first element must precede the second element in some fashion.

The term "determining" used in the present specification may include various operations. For example, "determining" may be considered as "determining" in terms of calculating (computing), processing (processing), deriving (deriving), investigating (visualizing), retrieving (navigating) (e.g., retrieving in a table, database or other data structure), confirming (authenticating), and the like. The "determination (decision)" may be regarded as "determination (decision)" performed by receiving (e.g., receiving information), transmitting (e.g., transmitting information), inputting (input), outputting (output), accessing (accessing) (e.g., accessing data in a memory), and the like. In addition, the "judgment (decision)" may be regarded as "judgment (decision)" to be performed, for example, resolution (resolving), selection (selecting), selection (breathing), establishment (evaluating), and comparison (comparing). That is, "judgment (decision)" may regard some operations as making "judgment (decision)".

The terms "connected", "coupled", and the like, or all variations thereof, used in this specification mean all connections or couplings, direct or indirect, between two or more elements, and can include a case where 1 or more intermediate elements exist between two elements that are "connected" or "coupled" to each other. The coupling or connection between the elements may be physical, logical, or a combination thereof. For example, "connection" may be replaced with "access".

In the present description, in the case where 2 elements are connected, it can be considered that 1 or more electric wires, cables, and/or printed electrical connections are used, and as a few non-limiting and non-exhaustive examples, electromagnetic energy having a wavelength of a wireless frequency domain, a microwave region, and/or a light (both visible and invisible) region, etc., are used to be "connected" or "coupled" to each other.

In the present specification, the term "a is different from B" may also mean "a is different from B". The terms "separate," "coupled," and the like may be construed similarly.

In the case where the terms "including", "containing" and "comprising" are used in the present specification or claims, these terms are intended to be inclusive in the same manner as the term "comprising". Further, the term "or" as used in the present specification or claims means not a logical exclusive or.

The present invention has been described in detail above, but it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in the present specification. The present invention can be implemented as modifications and variations without departing from the spirit and scope of the present invention defined by the claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

Claims (5)

1. A user terminal, comprising:

a receiving unit that receives downlink control information for indicating transmission and/or reception of data; and

and a control unit which controls activation and/or deactivation of more than 1 Bandwidth part (BWP) based on a field included in the downlink control information.

2. The user terminal of claim 1,

in case the field indicates a different BWP than the BWP the downlink control information was received, the control unit controls activation and/or deactivation of the different BWP.

3. The user terminal of claim 1 or claim 2,

the control unit determines a carrier including the 1 or more BWPs based on the field, and controls activation and/or deactivation of the 1 or more BWPs in the carrier.

4. The user terminal of any of claims 1 to 3,

the receiving unit receives a prescribed MAC (Medium Access Control) signaling,

the control unit controls activation and/or deactivation of the 1 or more BWPs based on the prescribed MAC signaling.

5. A wireless communication method of a user terminal, comprising:

a step of receiving downlink control information for instructing transmission and/or reception of data; and

and controlling activation and/or deactivation of more than 1 bandwidth part (BWP) based on a field included in the downlink control information.

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